CN102287845B - Elastic sealing fin device of rotary air pre-heater - Google Patents
Elastic sealing fin device of rotary air pre-heater Download PDFInfo
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- CN102287845B CN102287845B CN2011101304918A CN201110130491A CN102287845B CN 102287845 B CN102287845 B CN 102287845B CN 2011101304918 A CN2011101304918 A CN 2011101304918A CN 201110130491 A CN201110130491 A CN 201110130491A CN 102287845 B CN102287845 B CN 102287845B
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- sealing strip
- sealing
- air preheater
- elastic
- rotary air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to the field of rotary air pre-heaters, in particular to a sealing part of a rotary air pre-heater. An elastic sealing fin device of the rotary air pre-heater comprises a sealing strip, an elastic component and a supporting sheet, wherein the sealing strip and the supporting sheet are fixedly fixed with the two ends of the elastic component respectively; the elastic component comprises a plurality of groups of fixedly connected elastic units; and each group of elastic units consists of two metal sheets which are connected into the shape of inverse V. The sealing strip and the supporting sheet are connected through the elastic component, so the sealing strip is always kept in direct contact with a sealing plate without a clearance in a movement process; the metal sheets which are connected into the shape of inverse V can twist to drive the sealing strip to move in three directions, so the sealing strip and the sealing plate can be mutually contacted when the rotary air pre-heater is under any operation condition and cold-sate condition; and the clearance between the sealing strip and the sealing plate can be reduced to zero under any condition, so the air leakage rate of the rotary air pre-heater is reduced.
Description
Technical field
The present invention relates to the rotary regenerative air preheater field, relate in particular to a kind of rotary regenerative air preheater seal member.
Background technology
Rotary regenerative air preheater is for the flue gas of thermal power plant and air heat-exchange equipment.The heat-transfer surface of rotary regenerative air preheater by rotation will produce after the boiler combustion the heat transferred air of flue gas to improve the efficient of boiler.Rotary regenerative air preheater generally has following several form: the heating surface of two minutes storehouse air preheaters---this pattern air preheater is divided into two storehouse lattice, i.e. wind storehouse and flue gas storehouse; The heating surface of three minutes storehouse air preheaters---this pattern air preheater is divided into three storehouse lattice, i.e. wind storehouse, Secondary Air storehouse and a flue gas storehouse; The heating surface of four minutes storehouse air preheaters---this pattern air preheater is divided into four storehouse lattice, i.e. two Secondary Air storehouses, a Feng Cang and a flue gas storehouse.
Rotary regenerative air preheater exists different storehouse lattice, in the lattice of storehouse respectively by flue gas, wind and Secondary Air.Rotary regenerative air preheater rotarily driving in each storehouse lattice heating surface rotation and respectively successively by flue gas, wind and Secondary Air.Heat in the flue gas is sent to heating surface, and heating surface has been finished the exchange of heat from flue gas to time wind and Secondary Air thus with wind of heat transferred and Secondary Air when treating that this heating surface rotates to wind and Secondary Air storehouse lattice.Because the pressure of flue gas, wind and Secondary Air is different, so exist the smoke spillage of an on high-tension side wind and secondary wind direction low-pressure side.The leakage of wind and Secondary Air has caused entering the part air that boiler burns " short circuit " in air preheater, directly is discharged into again in the atmosphere from flue gas; Air-heater leakage causes primary air fan, and the capacity of overfire air fan and air-introduced machine increases, so that the power consumption of these blower fans increases, has wasted electric energy, so need to seal rotary regenerative air preheater.
The rotary regenerative air preheater hermetically-sealed construction comprises the trizonal sealing of axial seal, radial seal and bypass seal as shown in Figure 1.Axial seal comprises the axial sealing plate 2 that is installed between axial axial seal sheet 1 and the twice axial seal sheet 1, forms an airtight unit by axial seal sheet 1 and axial sealing plate 2.Radial seal comprises the apex seal 4 that is arranged on radially and the Sectorial sealplate 3 between the twice apex seal 4, be in operation in order to adapt to air preheater, because flue gas and air themperature differ the mushroom deformation of larger generation, the apex seal 4 that is arranged on radially is arc, forms an airtight unit by apex seal 4 and Sectorial sealplate 3.Bypass seal is comprised of rotor T steel and the hoop diaphragm seal 5 that is fixed on the housing.
Installing sealing device at air preheater is the routine configuration that has air preheater now to reduce air leak rate of air curtain, but owing to the diaphragm seal that has air preheater now only is common plate, diaphragm seal is along with air preheater rotates, and sealing plate maintains static.Can not contact between diaphragm seal and the sealing plate and should retain certain gap, the deformation that air preheater is in operation can cause the change of former seal interface.Be in operation and adapt to the variation of seal clearance in order to solve air preheater, keep best seal clearance usually to adopt following two kinds of means in the prior art.
(1) the gap tracking system is adopted in the hot junction of air preheater.Very large running clearance can appear in the air preheater hot junction, square being directly proportional of general and air preheater rotor diameter, 600,000 generating sets are about about 30mm, the 1000MW generating set is about about 50mm, as adopt self sealss scheme (the welding hot junction is static seal radially), then running time, the crack can increase.Adopting gap, hot junction tracking system then is the high and low position that is arranged on Sectorial sealplate radially by adjustment, can automatically regulate fanning strip and rotor radial seal sheet gap reduces leakage.The shortcoming of this mode is: automatic backlash tracking system complex structure, higher to maintenance requirement, the run time fault rate is higher.
(2) cold junction, axially reach the method that bypass seal adopts preset clearance.For the operation of many sealing systems, obtain a comparatively desirable sealing effectiveness, seal clearance is the smaller the better.The reservation that to cold junction, axially reaches the bypass seal gap during take its hot operation the seal clearance minimum be to reserve principle.The shortcoming of this method is: only can realize that at hot busy hour seal clearance is minimum, air leak rate of air curtain can rise in non-peak load situation.
In addition, above-mentioned two kinds of means can realize that the prerequisite of optimal seal effect is to predict exactly the expansion situation of air preheater when the design of sealing system, so that estimate when changing with design in the gap during actual motion is consistent.But because air preheater ruuning situation is very complicated, its each parts expansion situation is difficult to prior forecast.Therefore, it is stuck that diaphragm seal and sealing plate often occur during the rotary regenerative air preheater actual motion, causes the rotary regenerative air preheater rotary resistance greatly to increase and stop transport.Some power plant occurs in order to prevent above-mentioned fault, has a mind to tune up seal clearance, causes air leak rate of air preheater to increase.
Summary of the invention
Technical problem to be solved by this invention provides a kind of rotary regenerative air preheater elastic packing sheet devices, the sealing device adopts elastic parts to connect sealing strip and support chip, so that remaining at the volley with sealing plate, sealing strip directly contacts, very close to each other, reduced air leak rate of air curtain on largely.
The present invention is achieved in that a kind of rotary regenerative air preheater elastic packing sheet devices, comprise sealing strip, elastic parts and support chip, described sealing strip and support chip are fixedly linked with the two ends of elastic parts respectively, described elastic parts comprises the some groups of Flexible elements that are fixedly linked, and every group of Flexible element connects into lambdoid sheet metal by two and consist of.
Described sheet metal is the waveform sheet metal.
Described sheet metal is that the multi-disc sheet metal is formed by stacking.
Described foil material is stainless steel or spring steel.
Rotary regenerative air preheater elastic packing sheet devices of the present invention adopts elastic parts to connect sealing strip and support chip, directly contacts so that sealing strip can remain at the volley with sealing plate, and is very close to each other.In addition, because elastic parts has elasticity, so that sealing strip is not hard contact with contacting of sealing plate, select the elastic parts of proper stiffness can guarantee that the frictional resistance between sealing strip and the sealing plate is less, can not have influence on the shaft power of electric rotating machine; Connecting into lambdoid sheet metal can twist, and it is mobile at three-dimensional to drive sealing strip, so that rotary regenerative air preheater all is in contact with one another at any operating condition and cold conditions operating mode lower seal bar and sealing plate; The present invention under any circumstance can both so that the gap of sealing strip and sealing plate is reduced to almost nilly, reduce the air leak rate of air curtain of rotary regenerative air preheater.
Description of drawings
Fig. 1 is the perspective diagram of rotary regenerative air preheater hermetically-sealed construction;
Fig. 2 is that rotary regenerative air preheater elastic packing sheet devices prototype structure master of the present invention looks schematic diagram;
Fig. 3 is that the structure master after the rotary regenerative air preheater elastic packing sheet devices strain of the present invention looks schematic diagram;
Fig. 4 is the schematic diagram of the present invention when being used in bypass seal.
Among the figure: 1 axial seal sheet, 2 axial sealing plates, 3 Sectorial sealplates, 4 apex seals, 5 hoop diaphragm seals, 6 sealing surfaces, 11 sealing strips, 12 elastic parts, 13 support chips, 121 sheet metals.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's statement, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1
Shown in Fig. 2,3, a kind of rotary regenerative air preheater elastic packing sheet devices, comprise sealing strip 11, elastic parts 12 and support chip 13, described sealing strip 11 and support chip 13 are fixedly linked with the two ends of elastic parts 12 respectively, described elastic parts 12 comprises the some groups of Flexible elements that are fixedly linked, and every group of Flexible element connects into lambdoid sheet metal 121 by two and consist of.
During work, support chip 13 is fixed on the storehouse case frame of rotary regenerative air preheater, sealing strip 11 is by elastic force and sealing surface 6 close contacts of elastic parts 12, change the position of sealing strip 11 at three-dimensional by the strain of elastic parts 12, although so that rotary regenerative air preheater relative distance of storehouse lattice and sealing surface 6 under the different load operating condition changes, sealing strip 11 is in contact with one another with sealing surface 6 all the time.This structure is so that what friction occurs with sealing surface 6 only is sealing strip 11, by the elastic parts 12 of selecting proper stiffness, can guarantee that sealing strip 11 and sealing surface 6 contact positions only have very little frictional force, and so that the shaft power increase of rotary regenerative air preheater electric rotating machine seldom.
In the present embodiment, for rebound performance and the service life of improving sheet metal 121, described sheet metal 121 is the waveform sheet metal, and described sheet metal 121 is formed by stacking for the multi-disc sheet metal, and foil material is that stainless steel or spring steel are made; Compression by connecting into lambdoid sheet metal and loosening can make sealing strip 11 produce before and after and displacements up and down, can make sealing strip 11 produce three direction displacement by the torsional deflection that connects into lambdoid sheet metal and be in operation to adapt to rotary regenerative air preheater, because flue gas and air themperature differ the mushroom deformation of larger generation.
When rotary regenerative air preheater elastic packing sheet devices of the present invention is used for axial seal, support chip 13 is fixed on the axial storehouse case frame of rotary regenerative air preheater, sealing strip 11 is by elastic force and axial sealing plate 2 close contacts of elastic parts 12, and twice elastic sealing strip and axial sealing plate 2 form an airtight unit.
When the present invention is used for radial seal, support chip 13 is fixed on the radially storehouse case frame of rotary regenerative air preheater, sealing strip 11 is by elastic force and Sectorial sealplate 3 close contacts of elastic parts 12, and twice elastic sealing strip and Sectorial sealplate 3 form an airtight unit.
As shown in Figure 4, when the present invention was used for bypass seal, support chip 13 was fixed on the axial sealing plate 2 of housing, and sealing strip 11 forms closed cells by elastic force and the rotor T steel close contact of elastic parts 12.
Claims (4)
1. rotary regenerative air preheater elastic packing sheet devices, it is characterized in that: comprise sealing strip (11), elastic parts (12) and support chip (13), described sealing strip (11) and support chip (13) are fixedly linked with the two ends of elastic parts (12) respectively, described elastic parts (12) comprises the some groups of Flexible elements that are fixedly linked, and every group of Flexible element connects into lambdoid sheet metal (121) by two and consist of.
2. rotary regenerative air preheater elastic packing sheet devices as claimed in claim 1, it is characterized in that: described sheet metal (121) is the waveform sheet metal.
3. rotary regenerative air preheater elastic packing sheet devices as claimed in claim 1 or 2, it is characterized in that: described sheet metal (121) is formed by stacking for the multi-disc sheet metal.
4. rotary regenerative air preheater elastic packing sheet devices as claimed in claim 3, it is characterized in that: described foil material is stainless steel or spring steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101304918A CN102287845B (en) | 2011-05-19 | 2011-05-19 | Elastic sealing fin device of rotary air pre-heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101304918A CN102287845B (en) | 2011-05-19 | 2011-05-19 | Elastic sealing fin device of rotary air pre-heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102287845A CN102287845A (en) | 2011-12-21 |
| CN102287845B true CN102287845B (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101304918A Active CN102287845B (en) | 2011-05-19 | 2011-05-19 | Elastic sealing fin device of rotary air pre-heater |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402926B (en) * | 2016-10-28 | 2019-06-21 | 中山大学 | A kind of rotary regenerative air preheater and its pre-heating mean |
| CN112610978B (en) * | 2020-12-22 | 2023-03-24 | 南京市利澜电力节能科技有限公司 | Novel supporting structure of air preheater gasket |
| CN113405117B (en) * | 2021-06-08 | 2022-11-29 | 国家能源集团国源电力有限公司 | Air preheating equipment |
| CN113803740B (en) * | 2021-09-08 | 2024-04-09 | 大唐蒲城发电有限责任公司 | Air leakage prevention sealing device for rotor of air preheater |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4300614B2 (en) * | 1999-02-02 | 2009-07-22 | 株式会社Ｉｈｉ | Sealing device for rotary regenerative heat exchanger |
| CN201396781Y (en) * | 2009-05-05 | 2010-02-03 | 卫建 | Flexible and contacting type of sealing device |
| US8776864B2 (en) * | 2009-08-17 | 2014-07-15 | Paragon Airheater Technologies, Inc. | Full contact flexible seal assembly for heat exchanger |
| CN201496988U (en) * | 2009-09-03 | 2010-06-02 | 常州宝禹泰工业设备有限公司 | Heat expansion device of air preheater |
| CN102022543A (en) * | 2010-11-26 | 2011-04-20 | 北京化工大学 | Corrugated elastic seal and rotary air pre-heater sealing device |
| CN202056906U (en) * | 2011-05-19 | 2011-11-30 | 顾义 | Elastic sealing sheet device for rotary air preheater |
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